Noun. 1. synergy-the working together of two things (muscles or drugs for example) to produce an effect greater than the sum of their individual effects. synergism.
Cayenne pepper cranks the sauce up to 800 Scoville units of heat compared to Taco Bell's Fire Sauce at 500 Scoville units, which makes this the hottest stuff you can get at the chain. Now, with this secret formula, you can adjust the heat up or down to your preference just by playing with the amount of cayenne you add.
The very highest ones are not liquid at all. These are capsaicin extracts and are powders or crystals, as pure capsaicin comes in crystaline form. For more information on how the Scoville Scale for hot peppers and hot sauces is determined, read the What is the Scoville Scale article.